<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
        .box {
            width: 1210px;
            height: 44px;
            margin: 0 auto;
            background-color: pink;
        }
        .box2 {
            width: 100px;
            /*height: 44px;*/
            float: left;
            background-color: blue;
        }
        .box3 {
            width: 100px;
            height: 100px;
            float: left;
            background-color: purple;
        }

    </style>
</head>
<body>
<div class="box">
    <div class="box2">
        <div style="width: 10px;height: 44px;float:left;background-color: palegreen;"></div>
        <div style="width: 10px;height: 300px;float:left;background-color: yellow;"></div>
    </div>

</div>
<div class="box3"></div>
</body>
</html>